Added src directory

src/about_arrays.rb

@@ -0,0 +1,85 @@
+require 'edgecase'
+
+class AboutArrays < EdgeCase::Koan
+  def test_creating_arrays
+    empty_array = Array.new
+    assert_equal Array, empty_array.class
+    assert_equal __(0), empty_array.size
+  end
+
+  def test_array_literals
+    array = Array.new
+    assert_equal [], array
+
+    array[0] = 1
+    assert_equal [1], array
+
+    array[1] = 2
+    assert_equal [1, __(2)], array
+
+    array << 333
+    assert_equal __([1, 2, 333]), array
+  end
+
+  def test_accessing_array_elements
+    array = [:peanut, :butter, :and, :jelly]
+
+    assert_equal __(:peanut), array[0]
+    assert_equal __(:peanut), array.first
+    assert_equal __(:jelly), array[3]
+    assert_equal __(:jelly), array.last
+    assert_equal __(:jelly), array[-1]
+    assert_equal __(:butter), array[-3]
+  end
+
+  def test_slicing_arrays
+    array = [:peanut, :butter, :and, :jelly]
+
+    assert_equal __([:peanut]), array[0,1]
+    assert_equal __([:peanut, :butter]), array[0,2]
+    assert_equal __([:and, :jelly]), array[2,2]
+    assert_equal __([:and, :jelly]), array[2,20]
+    assert_equal __([]), array[4,0]
+    assert_equal __([]), array[4,100]
+    assert_equal __(nil), array[5,0]
+    assert_equal __(nil), array[5,0]
+  end
+
+  def test_arrays_and_ranges
+    assert_equal Range, (1..5).class
+    assert_not_equal [1,2,3,4,5], (1..5)
+    assert_equal [1,2,3,4,5], (1..5).to_a
+    assert_equal __([1,2,3,4]), (1...5).to_a
+  end
+
+  def test_slicing_with_ranges
+    array = [:peanut, :butter, :and, :jelly]
+
+    assert_equal __([:peanut, :butter, :and]), array[0..2]
+    assert_equal __([:peanut, :butter]), array[0...2]
+    assert_equal ([:and, :jelly]), array[2..-1]
+  end
+
+  def test_pushing_and_popping_arrays
+    array = [1,2]
+    array.push(:last)
+
+    assert_equal __([1, 2, :last]), array
+
+    popped_value = array.pop
+    assert_equal __(:last), popped_value
+    assert_equal __([1, 2]), array
+  end
+
+  def test_shifting_arrays
+    array = [1,2]
+    array.unshift(:first)
+
+    assert_equal __([:first, 1, 2]), array
+
+    shifted_value = array.shift
+    assert_equal __(:first), shifted_value
+    assert_equal __([1, 2]), array
+  end
+
+end